The apostle John writes: “Whoever commits sin also commits lawlessness, and sin is lawlessness” (1 John 3:4). From this verse we can learn that all unrighteousness is sin as far as God is concerned. It doesn’t matter how we might want to classify sin such as sins of ignorance, weakness, or even rebellion. If we are doing something contrary to Bible teaching, then it is sin. When we sin, we do so out of our own desire. The Bible says: “Let no one say when he is tempted, “I am tempted by God”; for God cannot be tempted by evil, nor does He Himself tempt anyone. But each one is tempted when he is drawn away by his own desires and enticed. Then, when desire has conceived, it gives birth to sin; and sin, when it is full-grown, brings forth death” (James 1:13-15).
Solomon wrote: “Keep your heart with all diligence, for out of it spring the issues of life” (Proverbs 4:23). The heart is the home and source of all desires. It does not matter whether these desires are good or evil, holy or unholy, they proceed from the heart. An evil heart cannot send forth a holy disposition or life. Continual evil and wicked deeds in life are proof of impurity in the heart. Jesus said: “For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders, thefts, covetousness, wickedness, deceit, lewdness, an evil eye, blasphemy, pride, foolishness. All these evil things come from within and defile a man” (Mark 7:21-23).